Grease gun



L? C. Cv. COOPER ,ET AL GBE-ASE GUN web 229, 9?

Filed July 1,4, 1924 sheets-sheer@ 2 hmmm Mach 229 C G COOPER ET AL GREASE GUN Filed my 1,4, 1924 5' Sheets-Sheet- Mat. R2 i192? y UNITED sTATEsPATEjNTi CHARLES G. COOPER AND ANDREW J. DINKEL, F YUMA, ARIZONA.

GREASE GUN.

Application nled July 14, 1924. Serial No. 725,963.

This invention aims to provide a gun out of which grease may be fed by'iuid pressure, for lubrication, the gun being so constructed that it may be loaded with grease at the forward end or at the rear end, in the various embodiments of the invention.

AlthoughY referred forms have been shown, it willA4 e understood that a mechanic, working within the scope of Mwhat iscl'aimed,

may make changes, without departing from the spirit of the invention. l

In the drawings z--Figure 1 shows 1n -longitudinal section, one form. oitheinvenuon; Figure 2 is an end elevation of the device depicted in Figurel; Figure 3 is an end view of the coupling and valve seat; Figure.

4 is a longitudinal section showing a modiication; Figure 5 is a top plan ot the 'device shown in Figure' 4; Figure 6 is an endelevation of the device delineated in Figure 4; Figure 7 is a section' taken on the line 77 of Figure 4; Figure 8 is a logitudinal section showing a modification, parts p being broken away; Figure 9 is a section on the line 9-'9 of Figure 8; Figure 10 is a perspective View oi the slug of grease adapted to be'used in any of the guns; Figure 11 is a sectional View illustrating one form of valve which may be used to control the admission o the fluid pressure to the ends of the cylinder. l

Referring to Figures 1, 2, 3, 10 and 11, the device includes a .cylinder 1 made up of a shell 2, and heads 3 and 4 secured at 5 to the opposite ends of the shell. The cylinder 1 includes a tubular extension 6 threaded into the head 3, and a tubular extension 7 threaded into the head 4, the heads having internal shoulders 8. Pairs of packing rings 9 are located in the heads 3 and 4, a metal spacer 10. being interposed between the rings of each pair, the packing rings and the spacers beine bound together, against the shoulders 8 ldy the inner ends of the eXtensions 6 and 7, the extensions being offset as at 11, to receive the outermost packing rings 9. An imperforate cap 12 is threaded on the end ot the extension 6. A cap 14 is threaded von the end of the extension 7 and is delivered to the point of use. c A piston 16 is mounted for reciprocation in the shell 2 of 'the cylinder 1 and is threaded on a combined coupling and valve'seat 1-7,

has an outlet 15 through which the grease of tubular form, the member 17 having, as

shown in Figure 3, internal arms 18 supporting a bearing 19 in which slides the stem 20 of a valve 21 adapted to cooperate with one end of the member 17. There are super posed nuts 23 on the valve stem 20, a compression spring 22 surrounding a portion of the valve stem and abutting against one of the nuts 23 and against the bearing 19, to hold the valve 21 closed. The numeral 24 denotes a two-part hollow piston rod which is slidable in the packing `rings 9, the piston rod being made up of tubular members 25 and 26, the said members being threaded at their inner ends on the coupling 17, and engaging the piston 16 to hold vthe same against rotation on the coupling 17. 'lhe tubular member 25 of thepston is adapted tooperatev in the cylinder extension 7, and the tubular member 26 of t-he piston is adapted .to operate in the cylinder extension 6. 1 l

The numeral y27 marks a U-shaped iuid pressure conduit communicating at` its ends with ports 28 located in the heads 3 and 4 and opening into the4 shell 2 of the cylinder,

on opposite sides of the piston 16. Any

suitable means'may be provided for controlling the flow of fluid pressure through the conduit 27. It' desired, a valve casing 29 may be interposed in the conduit 27, a hollow`valve 30 being `journaled in the casing. As disclosed in Figure 11, the valve 30 may be equipped with inlet ports 31 and with a circumferential exhaust port 32, the valve casing 29 having an exhaust port 33. VThe valve-30 has a stem 34 provided with a head 35, a compression spring 36 being disposed about the stem 34, between the casing 2 9' and the head 35, the function of the spring being to hold the valve 30 seated for rotation in the casing 29. A handle 37 on the valve stem 34 constitutes means whereby the valve may be operated.l

Owing to the simple construction of the valve, andl since any mechanical yequivalent may be substituted for the valve, the operation of the valve may be dismissed with the ber 26 of the piston rod is filled with grease, portion of the stem 62, one end of the spring and that the piston 16 with the parts 26 and abutting against the guide or bearing 61, 25 have moved to the ri ht in. Figure 1. and the other end dit the spring cooperating Then the cap 12 is remover? and a slug 38 of with ysuperposed nuts 65 on the inner end of .grease (Figure 10) is placed in the extenthe stem 62. A tubular valve seat 66 yis sion 6, the Acap 12 being replaced. Then, threaded into the outer end of the member when they iston 16 and artsv carried thereby v55 of the hollow pistonrod and has an inmove t t e left into t e position shown in ternal uide"`or bearing 67 'in which recpro-l Figure 1, the new charge of grease will Cates t e stem 68 of a valve 69 adapted vto force out of the member 26, the grease which seatoutwardly against the member 66 under is alread therein, the valve 2l opening, to the action of a retractile spring 70 extended Vpermit t e passage of the grease into the between the bearing or guide 67 and nuts 7l member 25. When the -piston 16 and parts on the stem 68. v barried thereby move to the right in Figure When the piston 52 and arts carried 1, the valve 21 Vis closed, and the grease, ultithereby move to the right in igure 8, the mately, is forced through the outlet 15, it, grease will be forced out of the tubular ex- 'being understood, of course, that the operatension 56 through the outlet 59, the valve tion above described may have to be carried 63 being closed, grease being supplied V15, ashereinbefore explained.

out a' few times until the gun is sufficiently through the hop r 57 as hereinbefore excharged with grease so that when the slug 38 plained. When t e piston 52 and arts carof grease is inserted into the, extension 6, as ried therebymove to the right in igure 8, aboveI explained, and when the piston 16 the valve 5() opens and admits air,to prevent moves to the right, there will be enough a partial vacuum in the left hand end ofthe grease in the gun so -that a part of the grease extension 48. When the piston 52 and parts will be forced to move through the outlet carried therebymoveto the left, the valves 69 and 63 open, thereby admitting air into In the 'form shown in Figures 8 and 9, the member 56 and preventing the grease many parts previously described are used, from being sucked back through the.out

`the gun being converted into a front loading let 59.

gun. Owing to the similarity between the p Referring to the form lshown in Figures devices shown in Figures 1 and 8, a portion `4, 5, Gand 7, the cylinder appears at 72 and f-ofthedescription of the structure delineated is provided at its rear end. with a' head 73.

.of grease shown in Figure 10. A cap 58 is 4 in Figure-8 may be reduced practically to a A tubular extension 74 is threaded `on the catalogue of parts, the cylinder appearing at :forward end of the cylinder and has a hop- 39 and including a shell 40 and heads 41'and per 75, there being a cap 76 on the forward 42 connected at 43 to the shell, the heads end of the part 74 thecap being supplied" having ports 44 communicating with the vwith an outlet 77 t rough which the grease iluid pressure conduit'45, the valve casing' vpasses to the point of'application. A port appearing at 46 and the valve 47 being ofthe `7 8 is formed in the rear endv of the extension sort hereinbeiore described., One extension ,74 and communicates with one end of the.

of the 'cylinder is marked by the numeral 48 `cylinder 72. A iuid or air'pressure conduit and carries a cap 49 provided with anin- 79communicates with the port 78 and comwardly opeiiing ball valve 50." The acking municates with the opposite end of the cyl- 51 for the piston rod is of the kind s own at inder 72, through the head 7 3.5 A valve cas- 9-10 in Figure 1. The piston 52 is threaded ing 80 is interposed in the conduit 79 and on a coupling '53 corresponding in some recarries a valve 81 of thesort hereinbefore' f spects to the coupling 17, the members of the described. The piston which reciprocates' in hollow piston rod being shown at 54 and at the cylinder 72 is marked by the numeral 82 55 and being threaded on the coupling 53 to and is carried by a hollow rod 83'slidable in i retain the piston 52. the base 84 of the extension 74, the 'hollow In the place of the extension 7 of Figure 1 piston rod 83 having an opening at one end, there is provided a tubular extension y56 of marked by the numeral 84 and located adja- Aany desired length, threaded into the head cent to the piston 82. -At the opposite end i 42 and provide ad acentto the head, with of the hollow member 83 there is a valve 85 a opper'57 adapta to receive the slug 38 which closes inwardly.

threaded. on the extension 56 and has an advanced, grease will be forced through the outlet 59 whereby the grease is conducted extension 74 and the outlet 77, grease being to the point of a plication. v supplied through the hopper 7 5. When the A tubular 'va ve seat 60 is threaded into parts 82 and 83 'move to the left in Figure 4, the forward end of the piston rod member the fluid in the cylinder 72 will iiow, to some 54 and has an in rnal guide 61 in which reextent, through the opening 84, the valve 85 ciprocates the s em 62 of a valve 63 held unseating, and suction being relieved in-the seated on the forward end of themember 60 extension 74 whilst the forward end of the by a compression spring 64 disposed about .a member 83 is moving from the cap 76 to the 12ol When tha piston and the member 83 are Leanser forward end of the hopper 75, the Vresult ders, reduced extensions removably mounted in the heads, one of the extensions having means for admitting grease, and one of the extensions having a grease outlet, packings engaged between the shoulders and the ends of the extensions, alined tubular members slidable in the packings and movable in the extensions, a coupling connecting the inner ends of the tubular members detachably, a piston slidable in the cylinder and mounted on the coupling,`the piston being bound between 'the tubular members, a valve movably supported .by the coupling, vthe coupling forming a seat for the valve, and means for admitting uid pressure to the cylinder upon opposite sides or the piston to secure a reciprocation ot' the piston and the tubular members. l

2. In a device of the class described, a cylinder including heads having internal shoule ders, reduced extensions mounted'removably in the heads, one vof the extensions having means for admitting grease, and oneof the extensions having a grease outlet, packings engaged between the shoulders and thc ends of the extensions alined tubular members slidable in thepackings and movable in the extensions, a coupling connecting the inner ends of. the tubular members detachably, a piston slidable in the cylindeitand mounted on the coupling, the piston being bound between the tubular members, a valve closing when v'the piston moves toward the grease outlet and controlling the bore of the tubular members, means for mounting the valve to move along With the tubular members, and

means for admitting fluidl pressure 'to the cylinder upon opposite sides of the piston, to

secure a reciprocation of the piston and the g tubular' members.

3` ln a device of the class described, a cylinder, reduced extensions mounted in the heads of the cylinder, one of the extensions y having means for admitting grease, and one of ythe extensions having a grease outlet, alined vtubular members movable in the extensions, a coupling connecting the inner ends of the tubular members, detachably, a piston slidable inthe cylinder and mounted tween thetubularv members, a valve movably supported by the coupling, the coupling forming a seat for the valve, and means for admitting fluid pressure to the cylinder upon opposite sides of the piston to secure a reciprocation of the piston and the tubular members.

' 4. ln a device of the classdescribed, a cylinder, reduced extensions mounted in the heads of 'the cylinder, one of the extensions having means for admitting grease, and one of the extensions having a grease outlet, alined tubular members movable in the extensions, a coupling connecting the inner ends of the tubular members,detachably, a

Vpiston slidable in the cylinder and ,mounted on the coupling, the piston being bound between .the tubular members, a, valve closing when the piston moves toward the grease outlet and controlling the bore of the tubu- -lar members, means for mounting the valve,

CHARLES e. eoorna. ANDREW J. DINKEL.

.nn the coupling, the piston being bound be- 

